Active power-factor correction circuit and related controller

A power factor correction and active technology, applied in the direction of output power conversion devices, electrical components, sustainable manufacturing/processing, etc., can solve the problems of high circuit design complexity, power consumption, and high manufacturing costs of squarers

Active Publication Date: 2013-05-22
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the circuit design complexity of the squarer is high, the circuit area occupied is large, the manufacturing cost is high, and it is often very power-hungry, thus creating obstacles in improving the power efficiency of the power factor correction circuit and further reducing the size of the circuit chip

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  • Active power-factor correction circuit and related controller
  • Active power-factor correction circuit and related controller

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Embodiment Construction

[0035] Embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals indicate the same or similar components or process steps.

[0036] Certain terms are used in the specification and subsequent claims to refer to particular components. It should be understood by those skilled in the art that the same component may be called by different terms. This description and subsequent patent applications do not use the difference in name as a way to distinguish components, but use the difference in function of components as a basis for differentiation. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to...". In addition, the term "coupled" herein includes any direct and indirect means of connection. Therefore, if it is described in the text that a first component is coupled to a second component, it ...

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Abstract

The invention provides an active power-factor correction circuit device which comprises a segment linear gain circuit, an error amplifier, a pulse width modulation controller and a pulse width modulation signal generator. The segment linear gain circuit is used for receiving feed-forward signals and generating corresponding gain signals, wherein sizes of the gain signals and sizes of the feed-forward signals are correlated in a broken line mode. The error amplifier is used for generating error signals according to output voltage of an alternating-current-to-direct-current converter. The pulse width controller is used for generating control signals according to the gain signals, the error signals, and the output voltage after being rectified of the alternating-current-to-direct-current converter. The pulse width modulation signal generator is used for generating pulse width modulation signals used for controlling a power switch of the alternating-current-to-direct-current converter according to the control signals. As a segment linear gain circuit is utilized to replace a traditional squarer, circuit complexity of an active power-factor correction circuit can be lowered, needed bias voltage sources are reduced, a circuit area is reduced, and electricity power consumption and cost are lowered.

Description

technical field [0001] The present invention relates to a power factor correction circuit, especially a control circuit for an active power factor correction circuit. Background technique [0002] Due to the increasing shortage of energy, people pay more and more attention to the power consumption efficiency of electronic devices. Most traditional AC-to-DC converters use diode rectifiers. Although this structure is simple and low-cost, due to the severe nonlinear distortion of the input current, it causes a large increase in low-frequency harmonics, resulting in a low power factor (PF) . Power factor refers to the ratio between effective power and apparent power, and is an index to measure the efficiency of power utilization. A low power factor will not only cause unnecessary waste of energy, but a large number of harmonics will also cause instability in the power system and troubles for generators, which will seriously affect the quality of power supply. [0003] A power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 林梓诚
Owner RICHTEK TECH
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